Optimized liquid-phase oxidation

Active Publication Date: 2006-09-14
ALPEK POLYESTER SA DE CV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0009] It is, therefore, an object of the present invention to provide a

Problems solved by technology

If the liquid phase of the multi-phase reaction medium contains an insufficient concentration of molecular oxygen (i.e., if certain portions of the reaction medium are “oxygen-starved”), undesirable side-reactions can generate impurities and/or the intended reactions can be retarded in rate.
If the liquid phase of the reaction medium contains too little of the oxidizable compound, the rate of reaction may be undesirably slow.
Further, if the liquid phase of the reaction medium contains an excess concentration of the oxidizable compound, additional undesirable side-reactions can generate impurities.
For example, CSTRs have a relatively high capital cost due to their requirement for expensive motors, fluid-sealed bearings and drive shafts, and/or complex stirring mechanisms.
Further, the rotating and/or oscillating mechanical components of conventional CSTRs require regular maintenance.
The labor and shutdown time associated wit

Method used

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Examples

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examples

[0282] Examples 1-4 pertain to pilot-scale oxidations of para-xylene to terephthalic acid conducted in a pilot-scale system assembled around a mechanically agitated, hot-oil jacketed, 2-gallon, titanium reaction vessel. The gas dispersion type agitator within the reaction vessel was rotated at about 1,500 revolutions per minute (rpm), and the power draw of the agitator was about 220 watts. The pilot-scale system was equipped with means to control the pressure and temperature within the reaction vessel and to control the gas and liquid flow rates entering the reaction vessel. The feed of para-xylene was provided via a syringe pump at an effectively steady rate of about 0.28 kilograms per hour. Catalyst feed solution was pumped from a catalyst feed tank into the reaction vessel at an effectively steady rate of about 3.2 kilograms per hour. Both para-xylene and catalyst feed solution were released into the reaction medium through a dip tube ending below the level of aerated slurry with...

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Abstract

Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reaction at relatively low temperatures. When the oxidized compound is para-xylene and the product from the oxidation reaction is crude terephthalic acid (CTA), such CTA product can be purified and separated by more economical techniques than could be employed if the CTA were formed by a conventional high-temperature oxidation process.

Description

FIELD OF THE INVENTION [0001] This invention relates generally to a process for the liquid-phase, catalytic oxidation of an aromatic compound. One aspect of the invention concerns the partial oxidation of a dialkyl aromatic compound (e.g., para-xylene) to produce a crude aromatic dicarboxylic acid (e.g., crude terephthalic acid), which can thereafter be subjected to purification and separation. Another aspect of the invention concerns an improved bubble column reactor that provides for a more effective and economical liquid-phase oxidation process. BACKGROUND OF THE INVENTION [0002] Liquid-phase oxidation reactions are employed in a variety of existing commercial processes. For example, liquid-phase oxidation is currently used for the oxidation of aldehydes to acids (e.g., propionaldehyde to propionic acid), the oxidation of cyclohexane to adipic acid, and the oxidation of alkyl aromatics to alcohols, acids, or diacids. A particularly significant commercial oxidation process in the ...

Claims

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Application Information

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IPC IPC(8): C07C51/16C07C51/255
CPCC07C51/265C07C63/26C07C51/16
Inventor WONDERS, ALAN GEORGELAVOIE, GINO GEORGESSUMNER, CHARLES EDWAN JR.DAVENPORT, BRYAN WAYNEDE VREEDE, MARCELTENNANT, BRENT ALAN
Owner ALPEK POLYESTER SA DE CV
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